Switching valve

Abstract

Disclosed is a switching valve having a small contact resistance when a valve body moves along a seating surface of a housing. In a switching valve which includes a valve body, coming into contact with a seating surface of a housing having a plurality of ports and selectively communicating at least two ports of the plurality of ports, and applies a fluid pressure to a back surface of the valve body, the switching valve includes a biasing member configured for biasing the valve body in a direction in which the valve body is moved away from the seating surface of the housing.

The invention claimed is: 
     
         1 . A switching valve comprising:
 a housing provided with a seating surface and a plurality of ports;   a valve body provided to be rotatable with respect to the housing; and configured for coming into contact with the seating surface of the housing and selectively communicating at least two ports of the plurality of ports of the housing; and   a rotary driving device configured to rotate the valve body,   wherein the rotary driving device includes a rotating shaft, a rotor fixed to the rotating shaft, a rotor casing having the rotor housed therein, and a stator having a coil and disposed on an outer periphery of the rotor casing,   both end portions of the rotating shaft are journaled,   the valve body is disposed to be axially movable together with the rotating shaft,   a fluid pressure is applied to a back surface of the valve body, and   the switching valve further comprises a biasing member disposed between the housing and the valve body and configured for biasing the valve body in a direction in which the valve body is moved away from the seating surface of the housing, and   the switching valve further comprises an annular thin plate disposed between the valve body and the biasing member and a coiled wave spring provided around the rotating shaft as the biasing member and configured to bias the valve member through the annular thin plate in the axial direction.   
     
     
         2 . The switching valve according to  claim 1 ,
 wherein the housing is provided with a bottomed opening portion in which at least part of an end portion of the rotating shaft and the biasing member are arranged.   
     
     
         3 . The switching valve according to  claim 2 ,
 wherein the valve body is provided with a bottomed opening portion into which at least part of an end portion of the rotating shaft and the biasing member are inserted.   
     
     
         4 . The switching valve according to  claim 2 ,
 wherein a communication path is formed to axially communicate with at least one of the rotor, the rotating shaft, and the rotor casing.   
     
     
         5 . The switching valve according to  claim 2 ,
 wherein the valve body has a sealing material that selectively surrounds at least two ports of the plurality of ports provided in the seating surface of the housing.   
     
     
         6 . The switching valve according to  claim 2 ,
 wherein the housing is provided with a space which accommodates the valve body and receives a fluid supplied from an introducing port included in the plurality of ports.   
     
     
         7 . The switching valve according to  claim 1 ,
 wherein the valve body is provided with a bottomed opening portion into which at least part of an end portion of the rotating shaft and the biasing member are inserted.   
     
     
         8 . The switching valve according to  claim 7 ,
 wherein a communication path is formed to axially communicate with at least one of the rotor, the rotating shaft, and the rotor casing.   
     
     
         9 . The switching valve according to  claim 1 ,
 wherein a communication path is formed to axially communicate with at least one of the rotor, the rotating shaft, and the rotor casing.   
     
     
         10 . The switching valve according to  claim 1 ,
 wherein the valve body has a sealing material that selectively surrounds at least two ports of the plurality of ports provided in the seating surface of the housing.   
     
     
         11 . The switching valve according to  claim 1 ,
 wherein the housing is provided with a space which accommodates the valve body and receives a fluid supplied from an introducing port included in the plurality of ports.